1. Remove old oem*.inf or att*.inf files in the \windows\inf directory (if any).

Skip to step 5 , if you install this driver in first time.

2. Remove any old copies of attmodem.vxd and attcom.vxd, especially from \windows or \windows\system.3. In Control Panel -> System -> Device Manager select Modem, then Remove any 1914BAV that might be installed.

4. In Control Panel -> System -> Device Manager select Ports, then Remove the COM port (if any) that the 1914BAV was previously using.